James h



@uiten giedre atmt @fr-z.

JAMES H.l STURDY, OF ATTLEBORO, MASSACHUSETTS,

Lette'rsiPatent No. 61,278, dated January 15, 1867.

IMPROVEMENT GENERATORS,

tlgettrhitle numb tu in ttm Est-a irteuttnh mating gaat tf vtlgs same.

lO ALL PERSONS TO WHOM THESE-PRESENTS SHALLCOME:

Be it known'that I, JAMES H. STURDY, of Attleboro, in the `county of Bristol, and State of Massachusetts, have invented. a new and useful Improvementein Steam Boilers; and I do hereby declare the sameto be fully described in the following specification, and represented in the accompanying drawings, of .which- YFigure l is a side elevationioi' a steam generator, constructed in accordance with my invention.

Figure 2 is arlower end view of it.

Figure 3 is atop view of it, as it appears withoutits cap.

Figure 4`is'an underside view; and

Figure 5`is`a transverse section of the cap.

The external surface'of the `body A of this boiler, as represented in the drawings, has the form of four heli- Acal grooves, a, b, c, ,i'ormed ina cylinder. One groove of each pair is jopen, and the. other is closed at its bottom; each groove at its top being open. v' lhelcap B, which rests on the top of the boiler, is formed with two separate conduits orchambers, e, j, each of which extends over the upper ends of two of two of the helical rooves so as to o en communication between such rooves. Besides these chambers there is a hole or assafr g, l 1 t i a P Y ce, Y

g, 'made'down through the cap, and to the top h of the boiler. This boiler is intended to be made of cast iron or other proper metal or material, and to be formed as a hollow vessel. It is to beferected directly over a fire-place or furnace, and is to be encased within a cylindrical drumyto tit closely to it, the whole being so that helically ascending andrdescending lues may be formed by the grooves and case, each of the ascending ilues being made to communicate at its top, through the cap, with one of the Idescending iiues. This descending ln'e should open at bottom into an escape flue or chimney, which, if desirable, may surround the case of the boiler,either impart or in whole. The smoke and gases from the fuel, when in combustion in the {ire-place, will pass up the ascending helical grooves or lines a c, and into and down the descending onesbd; and in their passage through such fines, such smoke and gaseswill impart heat to the o'uter surface4 of the boiler. The steam from the boiler may be taken from its top by a pipe leading dpwn the passage g in the cap. The water may also be supplied to the boiler by a pipe entering it at its top, or in any other proper part of it.

I do' not confine my invention to th'e precise number of helical grooves, as above stated, nor to the form of boiler, as set forth. as the said form and number of grooves may be varied andstill preserve the principle of my invention.

WhatI claim as of mysaid invention is as follows:

I claim a boiler constructed with helical ascending and descending grooves or ilues, arranged to extend around it, and made to communicate at or near their upper extremities, substantially as set forth.

I also claim the cap B, as made with-.the centraipassage g, and one or more chambers, e,f, the same being arranged init, substantially in manner and for the purpose as specified. t

I also claim Athe combination of the cap B, or its equivalent, with the boiler formed with two or any other greater number of helical lues, arranged in it substantially as described.

JAMES n. STURDY.

Witnesses R. H. EDDY, SAMUEL N. PIPER. 

